[Bug 1906266] Re: After upgrade: "libvirt.libvirtError: Requested operation is not valid: format of backing image %s of image %s was not specified"

[Felipe Reyes]

Adding a task for libvirt at Ubuntu/focal since this patch[0] might need
to be backported.

[0]
https://github.com/libvirt/libvirt/commit/ae9e6c2a2b75d958995c661f7bb64ed4353a6404

** Also affects: libvirt (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: libvirt (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: nova (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: libvirt (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: nova (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Changed in: libvirt (Ubuntu Groovy)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1906266

Title:
  After upgrade: "libvirt.libvirtError: Requested operation is not
  valid: format of backing image %s of image %s was not specified"

Status in OpenStack Compute (nova):
  Won't Fix
Status in libvirt package in Ubuntu:
  New
Status in nova package in Ubuntu:
  New
Status in libvirt source package in Focal:
  New
Status in nova source package in Focal:
  New
Status in libvirt source package in Groovy:
  Invalid
Status in nova source package in Groovy:
  New

Bug description:
  In a site upgraded to Ussuri we are getting faults starting instances

  2020-11-30 13:41:40.586 232871 ERROR oslo_messaging.rpc.server
  libvirt.libvirtError: Requested operation is not valid: format of
  backing image '/var/lib/nova/instances/_base/xxx' of image
  '/var/lib/nova/instances/xxx' was not specified in the image metadata
  (See https://libvirt.org/kbase/backing_chains.html for
  troubleshooting)

  Bug #1864020 reports similar symptoms, where due to an upstream change
  in Libvirt v6.0.0+ images need the backing format specified.

  The fix for Bug #1864020 handles the case for new instances. However,
  for upgraded instances we're hitting the same problem, as those still
  don't have backing format specified.

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